全文获取类型
收费全文 | 44502篇 |
免费 | 2263篇 |
国内免费 | 270篇 |
专业分类
耳鼻咽喉 | 266篇 |
儿科学 | 919篇 |
妇产科学 | 558篇 |
基础医学 | 5621篇 |
口腔科学 | 1083篇 |
临床医学 | 2975篇 |
内科学 | 11531篇 |
皮肤病学 | 764篇 |
神经病学 | 3568篇 |
特种医学 | 1931篇 |
外科学 | 7325篇 |
综合类 | 175篇 |
预防医学 | 1178篇 |
眼科学 | 710篇 |
药学 | 3154篇 |
中国医学 | 93篇 |
肿瘤学 | 5184篇 |
出版年
2023年 | 276篇 |
2022年 | 533篇 |
2021年 | 936篇 |
2020年 | 497篇 |
2019年 | 763篇 |
2018年 | 909篇 |
2017年 | 703篇 |
2016年 | 918篇 |
2015年 | 951篇 |
2014年 | 1311篇 |
2013年 | 1506篇 |
2012年 | 2374篇 |
2011年 | 2700篇 |
2010年 | 1442篇 |
2009年 | 1286篇 |
2008年 | 2260篇 |
2007年 | 2462篇 |
2006年 | 2437篇 |
2005年 | 2462篇 |
2004年 | 2360篇 |
2003年 | 2303篇 |
2002年 | 2297篇 |
2001年 | 1143篇 |
2000年 | 1100篇 |
1999年 | 1136篇 |
1998年 | 608篇 |
1997年 | 496篇 |
1996年 | 467篇 |
1995年 | 374篇 |
1994年 | 342篇 |
1993年 | 316篇 |
1992年 | 766篇 |
1991年 | 672篇 |
1990年 | 685篇 |
1989年 | 648篇 |
1988年 | 560篇 |
1987年 | 492篇 |
1986年 | 486篇 |
1985年 | 435篇 |
1984年 | 313篇 |
1983年 | 261篇 |
1982年 | 118篇 |
1981年 | 122篇 |
1980年 | 110篇 |
1979年 | 249篇 |
1978年 | 157篇 |
1977年 | 142篇 |
1975年 | 109篇 |
1972年 | 112篇 |
1971年 | 106篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Shingo Hashimoto Masaki Katsurada Rie Muramatsu Kumiko Asai Kenichiro Tanaka Kensuke Hayashi Yoshiaki Kibe Koichiro Nakajima Yukiko Hattori Hiromitsu Iwata Jun-etsu Mizoe Hiroyuki Ogino Yuta Shibamoto 《Practical radiation oncology》2019,9(2):e149-e155
Purpose
Suppression of respiratory movement of the liver would be desirable for high-precision radiation therapy for liver tumors. We aimed to investigate the effect of our original device-free compressed shell fixation method and breathing instruction on suppression of respiratory movement. The characteristics of liver motion based on the movement of a fiducial marker were also analyzed.Methods and Materials
First, respiratory amplitudes of the liver with the device-free compressed shell were analyzed from the data of 146 patients. The effect of this shell fixing method on liver movement was evaluated. Second, as another cohort study with 166 patients, interfractional internal motion of the liver for patients fixed in the shell was calculated using the fiducial marker coordinate data of images for position setting before daily irradiation. Third, in another 12 patients, intrafractional internal motion was calculated from the fiducial marker coordinate data using x-ray images before and after irradiation.Results
The median respiratory movement without the shell, after fixing with the shell, and after instructing on the breathing method with the shell was 14.2 (interquartile range, 10.7-19.8), 11.5 (8.6-17.5), and 10.4 mm (7.3-15.8), respectively. Systematic and random errors of interfractional internal motion were all ≤2 mm in the left-right and anteroposterior directions and 3.7 and 3.0 mm, respectively, in the craniocaudal direction. Systematic and random errors of intrafractional internal motion were all ≤1.3 mm in the left-right and anteroposterior directions and 0.8 and 2.4 mm, respectively, in the craniocaudal direction.Conclusions
The device-free compressed shell fixation method was effective in suppressing the respiratory movement of the liver. Irradiation position matching using the fiducial marker can correct the interfractional internal motion on each day, which would contribute to the reduction of the margin to be given around the target. 相似文献2.
Akira Mogi Toshiki Yajima Kenji Tomizawa Ryoichi Onozato Shigebumi Tanaka Hiroyuki Kuwano 《Annals of thoracic and cardiovascular surgery》2015,21(5):435-439
Purpose: Small pulmonary lesions that include ground-glass attenuation have been increasingly discovered because of progressive imaging diagnostic technologies. Despite the detection of such small lesions, sometimes it is quite difficult to localize them because of their size or considerable depth from the visceral pleura. In the present study, we examined the usefulness of computed tomography-guided lipiodol marking for thoracoscopic resection of impalpable pulmonary nodules.Methods: Fifty-six patients with an undiagnosed peripheral lesion(s) of the lung who had undergone preoperative computed tomography-guided lipiodol marking followed by video-assisted thoracoscopic surgery were studied.Results: All of the nodules were successfully marked by computed tomography-guided lipiodol marking, and all except for one case were localized by means of intraoperative fluoroscopy as clear spots. With regard to complications, pneumothorax occurred in 21 patients (37.5%), and only one patient required transient drainage. Although hemorrhaging in the lung parenchyma and hemosputum occurred in nine patients (16.1%) and one patient (1.8%), respectively, no patients were in serious condition. No intra- or postoperative mortality or morbidity was observed.Conclusion: Preoperative computed tomography-guided lipiodol marking of small or impalpable pulmonary nodules is a safe and useful procedure for thoracoscopic resection of the lung. 相似文献
3.
4.
5.
Byonggu An Yumi Zen Hiroya Akabori Naomi Kitamura Hiroyuki Ohta Akinori Otsuki Hiroo Mizuta Tomoyuki Tsujikawa Eiji Mekata 《Asian journal of endoscopic surgery》2021,14(1):120-123
A Bochdalek hernia (BH) is a congenital abnormality with incomplete closure of the diaphragm. It is usually manifested in infants but rarely in adults. Here, we report an adult patient with gastric volvulus and giant BH that were safely repaired by endoscopic reduction and elective laparoscopic surgery, respectively. A 79-year-old woman presented with left upper abdominal pain but no history of trauma. CT revealed a giant BH with gastric volvulus. After emergency endoscopic reduction of the volvulus, elective laparoscopic repair of the BH was performed. The 8 × 8-cm defect was repaired with interrupted nonabsorbable sutures and a mesh. The patient's postoperative course was uneventful, and no complications or recurrence were observed in the 6 months that followed. 相似文献
6.
7.
Kota Sahara Rin Yamada Takashi Fujiwara Koichi Koizumi Shin‐ichiro Horiguchi Tsunekazu Hishima Tatsuro Yamaguchi 《Digestive endoscopy》2015,27(7):768-771
Idiopathic myointimal hyperplasia of mesenteric veins (IMHMV) is a rare and poorly understood ischemic colitis that occurs in the rectosigmoid colon of predominantly young, previously healthy, male patients. A 76‐year‐old Japanese man presented to our hospital with a 1‐year history of worsening diarrhea, lower abdominal pain, and weight loss (−6 kg). Laboratory evaluation revealed white blood cell count of 13 200/μL, C‐reactive protein level of 2.0 mg/dL (normal range, 0.0–0.3), and negative results for stool culture (including Clostridium difficile). Colonoscopy showed circumferential and edematous narrowing of the sigmoid colon with deep longitude ulceration. Biopsy was done and examination of the specimen demonstrated no specific ischemia. The patient was treated with bowel rest, antibiotics, and i.v. fluids; however, his symptoms worsened. Finally, sigmoidectomy was carried out. Histological examination demonstrated significant myointimal hyperplasia of mesenteric veins leading to thickening and stenosis of the venous lumen. Therefore, the final diagnosis was IMHMV. Three months following sigmoidectomy, he was asymptomatic. 相似文献
8.
9.
10.